Quarter	Percent
1978-04-01	48.7176297368561
1978-07-01	49.1417606492345
1978-10-01	49.4750172746570
1979-01-01	47.7799120314751
1979-04-01	48.9156452698976
1979-07-01	49.2146848522140
1979-10-01	50.3482867458688
1980-01-01	49.2561981033142
1980-04-01	50.2243460513295
1980-07-01	50.9619196154822
1980-10-01	50.7385564967547
1981-01-01	49.4749980333268
1981-04-01	51.1131990047590
1981-07-01	51.4879595902061
1981-10-01	51.7217023959084
1982-01-01	50.1475199669428
1982-04-01	50.8222413236913
1982-07-01	51.2798643544309
1982-10-01	50.9519885278104
1983-01-01	49.0837713158856
1983-04-01	49.5853473967932
1983-07-01	49.9606456951736
1983-10-01	50.4708451075348
1984-01-01	49.3990305958648
1984-04-01	51.4368707768792
1984-07-01	52.1727425083719
1984-10-01	52.9910312886504
1985-01-01	51.9681178455516
1985-04-01	53.1308853681899
1985-07-01	54.0297394556175
1985-10-01	55.2177287530762
1986-01-01	54.4143834256299
1986-04-01	56.8953619523098
1986-07-01	57.1665152143462
1986-10-01	57.7155904707533
1987-01-01	56.0721243618767
1987-04-01	57.7615201812212
1987-07-01	58.0792855153886
1987-10-01	58.5077404026721
1988-01-01	57.9611340086299
1988-04-01	59.5548297982644
1988-07-01	60.0231688602658
1988-10-01	60.5696506175533
1989-01-01	59.4994485127835
1989-04-01	61.8521706910603
1989-07-01	62.6101810025548
1989-10-01	63.3769584514850
1990-01-01	62.2635685396328
1990-04-01	63.8721529542617
1990-07-01	63.3538169290353
1990-10-01	63.2490181062100
1991-01-01	61.6152488832975
1991-04-01	63.0276166433710
1991-07-01	62.6975529454663
1991-10-01	62.1044289472581
1992-01-01	61.3496688655980
1992-04-01	62.2953095675662
1992-07-01	62.5550912957748
1992-10-01	62.2281946535990
1993-01-01	60.7471750711624
1993-04-01	61.6929237218813
1993-07-01	61.9862471046362
1993-10-01	62.7254142268338
1994-01-01	61.4685790439454
1994-04-01	62.5752673629002
1994-07-01	63.4949055823917
1994-10-01	63.5598468047257
1995-01-01	62.8386048177914
1995-04-01	64.9289421376602
1995-07-01	65.4227584067334
1995-10-01	65.7036865684564
1996-01-01	64.1819053092318
1996-04-01	64.4310499853467
1996-07-01	64.8314957153955
1996-10-01	64.8793976310577
1997-01-01	63.9450037435479
1997-04-01	64.8550044490758
1997-07-01	65.2172084429111
1997-10-01	65.4056788512157
1998-01-01	64.0509411357682
1998-04-01	65.3703414302174
1998-07-01	65.8747850220847
1998-10-01	65.8937065859507
1999-01-01	64.4686300419353
1999-04-01	65.5904698240904
1999-07-01	66.0807054956143
1999-10-01	66.6446683922604
2000-01-01	65.2999328294295
2000-04-01	67.0222327342037
2000-07-01	68.2115560428540
2000-10-01	67.4562854513904
2001-01-01	66.4977559511870
2001-04-01	67.8383092681334
2001-07-01	67.8879446690104
2001-10-01	67.5187964391093
2002-01-01	66.8668893626737
2002-04-01	67.6394331551762
2002-07-01	68.5082229878216
2002-10-01	68.9030443124108
2003-01-01	68.5911475149341
2003-04-01	69.3054243861764
2003-07-01	69.0971943689067
2003-10-01	68.8398113855254
2004-01-01	67.6125655578922
2004-04-01	68.5749584566646
2004-07-01	68.9838872667008
2004-10-01	69.7219714593318
2005-01-01	69.5393968810894
2005-04-01	70.7877276303521
2005-07-01	71.1156779768141
2005-10-01	71.1325067334052
2006-01-01	70.0277278630680
2006-04-01	71.3071908580054
2006-07-01	71.8232530179221
2006-10-01	71.8449808094605
2007-01-01	70.9107348688510
2007-04-01	71.6256612296244
2007-07-01	72.2510424587296
2007-10-01	72.6653527775229
2008-01-01	71.7091913449024
2008-04-01	72.6050723948674
2008-07-01	72.5623048065781
2008-10-01	72.8429013825129
2009-01-01	72.0536467076259
2009-04-01	72.6184167350701
2009-07-01	72.0954441919270
2009-10-01	71.6321268914652
2010-01-01	70.8214919536144
2010-04-01	71.6517909463312
2010-07-01	72.3837359377433
2010-10-01	72.5087159781614
2011-01-01	71.6579699508994
2011-04-01	72.4997520385944
2011-07-01	72.5235967678723
2011-10-01	72.6405935845315
2012-01-01	71.6082223565469
2012-04-01	72.2748421939022
2012-07-01	72.7301465777943
2012-10-01	72.4771177186251
2013-01-01	71.8742153727898
2013-04-01	72.2940974493771
2013-07-01	72.3291422787411
2013-10-01	72.4638791115961
2014-01-01	71.5787360704358
2014-04-01	72.1918380804087
2014-07-01	71.9590311729834
2014-10-01	72.1677986004695
2015-01-01	71.8068796379562
2015-04-01	72.6680765481617
2015-07-01	72.6305959705687
2015-10-01	73.1840435917125
2016-01-01	72.3931003547126
2016-04-01	73.1537187309553
2016-07-01	73.2081137072328
2016-10-01	73.4650320402033
2017-01-01	72.5156786600528
2017-04-01	73.9014799538268
2017-07-01	74.1789674931846
2017-10-01	75.2293011728439
2018-01-01	74.6481643428878
2018-04-01	75.1865392445316
2018-07-01	74.9226430077315